Superior Performance combined with Superior Comfort. Ideal for large indoor stadiums, outdoor arenas, on site disaster management, search & rescue! Advanced science and technology makes the Sonik Blast CMG Safety Pealess Whistle the most efficient whistle in its class! Precise whistle chamber calibration assures pure frequency performance; less effort, crisper sound. Flawless patented pealess whistle emits distinct louder pitch without a lot of effort. Superior clear loud blast can be heard over long distances and intense ambient noise. Cushioned Mouth Grip provides additional comfort and is perfect for reliably holding the whistle in the mouth in wet conditions. Design: 2-chamber/4 resonators; pealess + Cushioned Mouth Grip (CMG). Sound Power: Exceeds 120 dB.